National News

'Mounting evidence' Boston bombers involved in 2011 triple murder

Massachusetts investigators have developed what they call "mounting evidence," bolstered by "forensic hits," that point to the possible involvement of both Tamerlan Tsarnaev and his younger brother Dzhokhar in a gruesome, unsolved triple homicide in 2011, law enforcement officials told ABC News.

The officials cautioned that until more definitive DNA testing is complete, it is still too early to consider bringing an indictment against the younger of the two brothers, who officials said has admitted his role in the Boston Marathon bombings that killed three and injured 260 more on April 15. Tamerlan was killed in a shootout with police days after the Marathon bombing attack, but Dhzokhar survived and was captured.